[erlang-questions] count events within last XX minutes
Sun Aug 26 11:45:21 CEST 2012
On 08/26/2012 10:41 AM, Gleb Peregud wrote:
> On Sunday, August 26, 2012, Max Bourinov wrote:
> Lately when working on project with up to a million concurrent
> clients connected I had to replace few instances of central
> servers with a public ets'es to avoid bottlenecks under heavy
> concurrent access. So choice of data storage may depend on what
> are access patterns of your data - i.e. how concurrent reads and
> writes are.
> That is a good point.
> I have idea how to utilize ETS in my case too: one process will
> write to ETS, and all other will read from ETS.
> The question now: will it benefit me or not?
> Probably yes, if read_concurrency is enabled and you have enough
> concurrent processes reading data. The best way to answer for sure is to
> implement both and measure under some high load situation.
If he's using update_counter then he only needs write_concurrency.
update_counter is a write operation that also returns the new value; if
you update_counter with an increment of 0, then you just happened to
read the value with a write context.
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